Thromb Haemost 2004; 91(03): 506-513
DOI: 10.1160/TH03-05-0272
Theme Issue Article
Schattauer GmbH

Plasma MMP–2 and MMP–9 and their inhibitors TIMP-1 and TIMP-2 during human orthotopic liver transplantation

The effect of aprotinin and the relation to ischemia/reperfusion injury
Johan Ph. Kuyvenhoven
1   Department of Gastroenterology and Hepatology, Leiden, The Netherlands
,
Quintus I. Molenaar
2   Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands
,
Hein W. Verspaget
1   Department of Gastroenterology and Hepatology, Leiden, The Netherlands
,
Marietta G. Veldman
2   Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands
,
Gualtiero Palareti
3   Department of Angiology and Blood Coagulation, University Hospital S. Orsola, Bologna, Italy
,
Cristina Legnani
3   Department of Angiology and Blood Coagulation, University Hospital S. Orsola, Bologna, Italy
,
Sanne E. Moolenburgh
4   Department of Surgery, Section of Hepatobiliary Surgery and Liver Transplantation, Groningen University Hospital, Groningen, The Netherlands
,
Onno T. Terpstra
2   Department of Surgery, Leiden University Medical Center, Leiden, The Netherlands
,
Cornelis B.H.W. Lamers
1   Department of Gastroenterology and Hepatology, Leiden, The Netherlands
,
Bart van Hoek
1   Department of Gastroenterology and Hepatology, Leiden, The Netherlands
,
Robert J. Porte
4   Department of Surgery, Section of Hepatobiliary Surgery and Liver Transplantation, Groningen University Hospital, Groningen, The Netherlands
› Author Affiliations

Financial support: Part of this study was supported by The Netherlands Digestive Diseases Foundation (Nieuwegein, The Netherlands). Study medication was a gift from Bayer AG (Wuppertal, Germany).
Further Information

Publication History

Received 08 May 2003

Accepted after resubmission 28 January 2003

Publication Date:
05 December 2017 (online)

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Summary

Uncontrolled activation of matrix metalloproteinases (MMPs) can result in tissue injury and inflammation, yet little is known about the activation of MMPs during orthotopic liver transplantation (OLT). OLT is associated with increased fibrinolytic activity due to elevated plasmin generation. The serine-protease plasmin not only causes degradation of fibrin clots but is also thought, amongst others, to play a role in the activation of some matrix metalloproteinases. We therefore studied the evolution of MMP-2 and -9 plasma concentrations during OLT and the effect of serine-protease inhibition by aprotinin on the level and activation of these MMPs. In a group of 24 patients who participated in a randomized, double-blind, placebo-controlled study we determined serial MMP-2 and MMP-9 plasma levels during transplantation using ELISA (total MMP), activity assays (activatable MMP) and zymography. In addition, the MMP-inhibitors TIMP-1 and TIMP-2 were assessed by ELISA. The putative regulating factors tumor necrosis factor alpha (TNF-α) and tissue-type plasminogen activator (t-PA) were assessed as well. Patients were administered high-dose aprotinin, regular-dose aprotinin or placebo during surgery. Plasma TIMP-1, TIMP-2 and MMP-2 level gradually decreased during transplantation. Approximately twothirds of total MMP-2 appeared to be in its activatable proMMP form. No release of MMP-2 from the graft could be detected. In contrast, plasma levels of MMP-9 increased sharply during the anhepatic and postreperfusion periods. Peak MMP-9 levels of about eight times above baseline were found at 30 minutes after reperfusion. Most MMP-9 appeared to be in its active/inhibitorcomplexed form. No significant differences were observed between the three treatment groups. However, in patients with more severe ischemia/reperfusion (I/R) injury the MMP-9 concentration, particularly of the active/inhibitor-complexed form, remained high at 120 minutes postreperfusion compared to patients with no or mild I/R injury. The decrease in plasma levels of MMP-2,TIMP-1 and TIMP-2 during OLT occurred irrespective of the severity of the I/R injury. There was a significant correlation between MMP-9 and t-PA levels, but not with TNF-α. In conclusion, OLT is associated with a sharp increase of MMP-9 during the anhepatic and postreperfusion periods, which coincided with the changes in t-PA. MMP-2, TIMP-1 and TIMP-2 gradually decreased during OLT. The composition of these MMPs was not altered by the use of aprotinin, suggesting that serine–protease/plasmin-independent pathways are responsible for MMP regulation during OLT. In addition, only MMP-9 seems to be involved in I/R injury during human liver transplantation.